Yes, these massive share trades are normal, but i've seen them increase as the correction took us lower. $AAPL for example has had about 2m share trades at the bell the past few trading days, except today was a 4m share trade. charts below, these are 5min charts.
What is this telling us? well, you can't read too much into it, but i like to think smart money is not being as fearful as the average investor/retailer. Fear levels are super low, it's the time to buy.